The Williamsburg Bridge connects Manhattan and Brooklyn at Delancy Street. The design includes a 1,600-foot main suspension span and two 300-foot side spans supported by steel arches. The total length with approaches is 7,200 feet. The original configuration included 6 rail tracks, four lanes of vehicular traffic and two pedestrian walkways. The current configuration includes six lanes of traffic, the J/M/Z subway lines and a single pedestrian walkway. The original design was by Leffert L. Buck and Henry Hornbostel, supervised by Gustav Lindenthal. The bridge opened to traffic on December 19, 1903.